MEDIUM
IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the redirect URI on the authorization response page, which might lead to XSS in some configurations
Published Mar 22, 2018
6.1
MEDIUMCVSS 3.0
EPSS 1.21%
Description
IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the redirect URI on the authorization response page, which might lead to XSS in some configurations.
Affected products
No data.
OR
- ≥ 1.0.0 · ≤ 1.5.2
- ≥ 2.0.0 · ≤ 2.1.2
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
6.1 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Impact Low
Integrity Impact Low
Availability Impact None
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.21% 0.01215
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.01215
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.21% (0.01215) | 67.46th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.21% (0.01215) | 67.22th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.12% (0.00123) | 47.29th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.12% (0.00123) | 45.97th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.17% (0.00170) | 52.31th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.04% (0.01040) | 28.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01040) | 0.00th | v1 |
Weaknesses (1)
References (4)
- https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895 x_refsource_MISCPatchThird Party Advisory
- https://github.com/IdentityServer/IdentityServer4/issues/2164 x_refsource_MISCIssue TrackingThird Party Advisory
- https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3 x_refsource_MISCThird Party Advisory
- https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3 x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895 | x_refsource_MISCPatchThird Party Advisory | |
| https://github.com/IdentityServer/IdentityServer4/issues/2164 | x_refsource_MISCIssue TrackingThird Party Advisory | |
| https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3 | x_refsource_MISCThird Party Advisory | |
| https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3 | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Mar 22, 2018
Updated Aug 5, 2024
Reserved Mar 21, 2018
Link CVE-2018-8899
CISA Vulnrichment
Updated n/a